ARUP's Laboratory Test Directory

Allergens, Inhalants, Southwest Extended Profile : 0055375

Mnemonic: SWEXT

Methodology: Quantitative ImmunoCAP® Fluorescent Enzyme Immunoassay
Performed: Sun-Sat
Reported: 1-2 days
Specimen Required: Patient Prep: Multiple patient encounters should be avoided.

Collect: Serum separator tube. Multiple specimen tubes should be avoided.

Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Transfer 3.25 mL serum to an ARUP Standard Transport Tube. (Min: 1.44 mL)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Hemolyzed, icteric, or lipemic specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year

Reference Interval:
Allergens included: Alternaria alternata (tenuis), Aspergillus fumigatus, Bahia Grass, Bermuda Grass, Cat Epithelium & Dander, Cottonwood Tree, D. farinae (Mites), Dog Dander, Egg White, Elm Tree, Giant Ragweed, False Ragweed, Hormodendrum (Cladosporium), House Dust Greer, House Dust Stier, Johnson Grass, June Grass/Kentucky Bluegrass, Lamb's Quarters, Box Elder/Maple Tree, Marsh Elder, Mesquite Tree, Milk (Cow's), Mountain Cedar (Juniper) Tree, Oak Tree, Pecan (White Hickory) Tree, Penicillium notatum, Russian Thistle, Timothy Grass, Wheat, White Ash Tree, Sagebrush/Wormwood.

Less than 0.10 kU/L: No significant level detected
0.10-0.34 kU/L: Clinical relevance undetermined
0.35-0.70 kU/L: Low
0.71-3.50 kU/L: Moderate
3.51-17.50 kU/L: High
17.51 kU/L or Greater: Very High
Interpretive Data: Allergen results of 0.10-0.34 kU/L are intended for specialist use as the clinical relevance is undetermined. Although increasing ranges are reflective of increasing concentrations of allergen-specific IgE, this may not correlate with the degree of clinical response or skin testing when challenged with a specific allergen. The correlation of allergy laboratory results with clinical history and in vivo reactivity to specific allergens is essential. A negative test may not rule out clinical allergy or even anaphylaxis.
CPT Code(s): 86003 per allergen